The Truth About Cars » recalled gas pedal fix The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. Thu, 24 Jul 2014 17:47:59 +0000 en-US hourly 1 The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars no The Truth About Cars (The Truth About Cars) 2006-2009 The Truth About Cars The Truth About Cars is dedicated to providing candid, unbiased automobile reviews and the latest in auto industry news. The Truth About Cars » recalled gas pedal fix The Complete Guide To Toyota Gas Pedals: Teardown, Pictures, Toyota’s Fix, Analysis, And Commentary Wed, 03 Mar 2010 18:27:56 +0000

Here’s TTAC’s and the web’s only complete guide to Toyota’s gas pedals (so far), with tear downs, pictures, analysis, explanation, the shim fix, and commentary, all consolidated into one portal:

Part 1: Exclusive: TTAC Takes Apart Both Toyota Gas Pedals: Tear down of both the recalled CTS pedal assembly and the non-recalled Denso pedal assembly. Note: Assumptions and conclusions in this initial tear down lack the more complete understanding of the importance of the friction arm aspect of the CTS unit.

Part 2: Toyota Gas Pedal Fix Explained – With Exclusive Photos: Describes Toyota’s proposed fix for the recalled CTS gas pedal assembly, with detailed photos and graphics. Explains the significance of the friction arm assembly and its limitations.

Part 3: Toyota Gas Pedal Fix Simulated – Friction Reduced, By Too Much?: TTAC simulates the fix prescribed by Toyota for the recalled CTS pedal assembly, and notes how the fix changes the degree of friction, and the possible unintended result. With detailed pictures

Part 4: Why Toyota Must Replace Flawed CTS Gas Pedal With Superior Denso Pedal: Detailed analysis with pictures of the two pedal assemblies, an explanation as to why the Denso design is superior, and a call for having all CTS pedals replaced with the Denso pedal.

Part 5: TTAC Does The Toyota Pedal Shim Fix:¬† Stop Gap Solution At Best: Toyota’s solution is carried out here with detailed pictures, the whole Toyota document detailing the fix, and our commentary.

Part 6: Toyota Floor Mat/Gas pedal Recall Includes Computer Reflash And Trimming Of Gas Pedals: Info on the details of the floor mat/gas pedal interference recall.

Part 7: Toyota Recall  Creates Unintended Accelerator Consequences: As predicted in Part 4 (above), the CTS shim fix reduces the carefully designed amount of friction required for comfortable and smooth pedal action to the point where pedal action may now be jerky and potentially unsafe.

(Thanks to you-know-who-you-are for access to these parts and info)

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Toyota Gas Pedal Fix Simulated: Friction Reduced, But By Too Much? Mon, 01 Feb 2010 21:01:59 +0000

Update: a portal to all of TTAC’s articles on the subject of Toyota gas pedals is here:

We’ve taken it apart, explained Toyota’s intended fix, and now we’ve replicated the “fix” to see what effect it has. It works, but does it work too well?

In the photo above, the two friction teeth are shown in their operating position before the “fix”. One can easily see their pivot axle sticking out to both sides, in a lighter gray color, just where the friction unit protruded from the housing. The other end of this friction unit is the retainer for the return spring, and this is what creates the pressure on the friction teeth.

The second picture (above) shows the other end of this unit. The round end in the middle of the unit is where the coil spring is retained. The gap as shown in this picture is where the metal spacer would go. It would change the fulcrum angle, and the amount of pressure that the spring would exert on the friction teeth.

In the third picture (above) we have inserted a 1/8″ thick screwdriver shank to simulate a spacer in this area. We don’t know yet what thickness the Toyota space will have, so this is an arbitrary guess to see the effect. The amount of friction was substantially reduced by this increase in the gap, and the change in the fulcrum angle of the friction bar unit. We were not able to actually install the unit in a car to see how it would feel, but the change in feel was very noticeable to the hand.

As we’ve explained in the prior post, the balance of friction to the control spring is what creates a stable, yet safe pedal assembly. By reducing the friction, the pedal will feel “less stable”, and it might be more difficult to maintain a steady throttle opening. The perceived pressure felt by the foot will also be greater. The degree of this affect will of course depend on the thickness of the spacer Toyota specifies.

Undoubtedly, this fix will profoundly reduce the likelihood or possibility of the pedal being stuck or slow to return. But the trade off may not be immaterial. Undoubtedly, Toyota’s intended degree of friction will be compromised by this fix, to one degree or another. And drivers may find the fix unpleasant or uncomfortable, also to some degree or another. Clearly, this fix is a band aid to fix the intrinsic limitations of this design. We will be taking a closer look at the Denso pedal next to see how their design is different.

Update: The final article in this series compares the two pedals (CTS and Denso), and makes a recommendation. Link here.

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